Electric steel-furnace



H. F. PRIWER. ELECTRIC STEEL FURNACE.

. APPLICATION FILED JUNE 15. 1920 Patented 001. 11, 1921.

4 SHEETSSHEET I.

- INVENTOR.

ATTORNEYS.

H. F. PRIWER.

ELECTRIC STEEL FURNACE. APPLICATION FILED JUNE 15, I920 1,392,965. Patented Oct. 11, 1921.

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A TTORNEYS.

H. F. PRIWER.

ELECTRIC STEEL FURNACE.

APPLICATION HLED mm: 15. 1920.

1,392,965. Patented Oct. 11, 1921.

4 SHEETS-SHEET 4.

WITNESS.

I N V N TOR.

V BY 2 r A TTORNEYS.

UNITED STATES PIA'TE'NT OFFICE.

HERMAN F. PRIWER, OF SPRINGFIELD, OHIO, ASSIGNOR OF ONE-HALF T JOHN E.

' GALV'IN.

ELECTRIC STEEL-FURNACE. I

Specification of Letters Patent. Patented Oct. 11, 1921.

Application filed June 15, 1920. Serial No. 389,074.

a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Electric Steel- Furnaces, of which the following is a specification.

This invention relates. to improvements in electric furnaces such-as used, for "example, in producing steel, and one of the primary objects of my inventionis to provide a construction whereby the furnace may be more easily and quickly charged. More specifically, it is one of the objects" of my invention to provide a construction whereby the body of the furnace proper may be shifted with respect to the cover for charging purposes, and the mounting of the parts or mechanism operatively associated with the electrodes on the cover to permit of such shifting. I

My invention, in general, contemplates a simple. inexpensive and efficient means or construction whereby the foregoing and other objects may be attained.

I accomplish the same by means of a construction which I have illustrated in preferred form in the accompanying drawings, wherein- Fi ure 1 is a plan view of a furnace embodying m improvements; Fig. 2. is an elevation of ig. 1; Fi 3 and Fig. tare sections taken on the lines 3--3 and 4.4, respectively, of Fig. 1; and Fig. 5 is a more or less diagrammatic view illustrating the relative relation of the parts when ready to charge. I

Referring to Figs. l to 4 inclusive, it will be seen that the furnace body proper or hearth A is composed of the usual sheet steel shell 7 which is lined with suitable refractory material 8 such as silica sand where the acid process is followed, or a basic refractory where basic process is desired, and is provided on each of two 0p-' po site sides with a trunnion 9, such trunnions being adapted to rest upon the standards '10 of the traveler B- The traveler B is composed of a suitable framework comprised of structural steel members and provided with wheels 11 riding on rails 12 in the pit C. A suitably supported motor 13 drives the axle 1 1 of the traveler through the nedillm of the work gear 15 and the gear in he roof or cover D consists of the fire bricks 17 suitably bound together at the periphery, as indicated at 18 and it is carried on an annular flan ed frame 19 in the manner hereinafter set orth, which in turn rests upon a series of angles or ledges'21 secured to the sides of. the hearth. The frame 19 also supports the standards or posts 22 which carry the brackets or clamps 23 which adjustably receive the electrodes 24:. It also supports the winches 25 and their actuating mechanism by means of which the electrodes are lowered and raised. Stated in other Words the roof, electrodes and winches and associated parts are self-contained so as topermit of the elevation thereof when it is desired to shift the traveler and hearth to charge the latter.

The roof is elevated as follows: on each side of the furnace I provide a jack 26, suitabl mounted on the base of the pit, such jac is being of any desired type, preferably of the screw type shown. These jacks are operated by the bevel gears 27, pinions 28 and shaft 29 in the manner indicated. In lower position the upper ends of the jacks are clear of the frame 19 to permit of the tilting of the furnace for drawing off the slag or the metal, and when raised they engage the under face of the frame for lifting the latter. .The frame is preferably recessed as at 30 and the jacks are preferably doweled as at 31 to prevent shifting of the roof with respect to the jacks, and, in order to prevent tilting of the roof on the jacks, one of the latter is provided with a widened supporting member 32 (see Fig. 4), which, in effect, provides a three point support.

From the foregoing it will be observed that in charging the furnace, the roof is elevated as described after which the traveler shifts the hearth along the pit clear of the roof to a point where fresh charge may be conveniently added, as through a suitablehopper or drop bottom bucket (not shown).-

permit of charging, but this involves many undesirable features of construction and practical difliculties in operation,

In order to prevent shifting of. the axis of the furnace, z'. e., shifting o' of thetrunnions on the standards, I' prefer to provide the trunnions with a toothed segment 35 engaging a correspondingly apertured plate 36 on the standards, by vlrtue of which, the furnace will always be maintained in proper position both with respect to the standards and the jacks when tilted back and forth. A sand joint is provided between the roof and hearth, and the roof is carried on the frame 19 by means of three or more brackets 40, secured to. the roof bands and having a yielding connection with the frame 19 through the medium of the bolts 41 (carried by the latter and projecting through the brackets) and the springs 42,

I claim: 1

1. In an electric furnace, the combination of a hearth; and. a roof, electrodes and power operating mechanism therefor all arranged so as to be movable together; and means for raising the roof.

2. In an electrlc furnace, the combination of a traveler having supports, a hearth trunnioned on said supports, a removable roof, and means mounted adjacent the furnace and operable to engage the roof for lifting the latter, said means when in inoperative position permitting tilting of the furnace.

3. In an electric furnace, the combination of a'hearth,'a frame, a roof carried on said frame, and means engaging said frame to elevate the same, said means being mounted adjacent the furnace and being normally out of engagement with the frame.

4t. In an electric furnace, the combinationof a hearth, a frame, a roof carried on'said frame, and means engaging said frame to elevate the same, said means comprising a pair of oppositely arranged jachs,.at least the position permit of the traveler being shifted toclear the furnace from the roof.

7. In an electric furnace the combination of a hearth, a frame adapted to be support- .ed on the hearth, a roof carried by said frame, and a lost motion connection between the frame and roof.

8. in an electric furnace the combination on the hearth, a roof carried by said frame and a yielding connection between the frame and roof.

9. lin an electric furnace,-the combination of a hearth, a' roof, a frame'for the roof, a plurality of, jacks mounted adjacent the hearth and movable upward to engage the frame to raise the roof clear of the hearth, and a common operating means for said jacks.

10. In an electric furnace,'the combination of a hearth, a roof, a framefor the roofanda plurality of jacks mounted on opposite sides of the hearth and movable upwardly to engage the frame to raise-the roof clear of the hearth, and means for shifting the hearth. 11. In an electric furnace, the combination of a pit, a movable hearth mounted in the pit, a removable roof for said hearth, and means mounted in the pit adapted to elevate said roof.

In testimony whereof, I have hereunto signed my name. v

HERMAN l PRIWER. 

